Crashes on iOS

[BillSempsrott]

On iOS devices, I'm seeing crashes when I try to connect to my server. Everything is working fine on Android, Windows, and Mac.

Strangely, everything works great on iOS the first time I run the game after deploying it to the device. If I then force-quit the app and then launch it again, it crashes when I try to connect. If I fully restart the phone, it will work again once and then start crashing again (until I restart the phone again).

I'm seeing the same behavior in development builds (loaded to the phone via USB cable in Xcode), shipping/distribution builds (deployed via TestFlight), and on multiple iPhones running different versions of iOS.

I'm using C++ and the FSocketIONative class, but I get the exact same behavior if I use the Blueprint actor component instead.

I'm using Unreal Engine 5.3.2, Xcode 15.4.0, and version 2.8.0 of the SocketIO plugin.

Attached below is a full stack trace of the crash. I've tried everything I can think of to debug this, and I just can't seem to determine the cause. It seems like it could be caused by some sort of incompatibility with one of the third-party dependencies (asio or websocketpp?), but that's just speculation at this point.

Is anyone else having this problem on iOS? Does anyone have any ideas?

ios-crash-stack-trace.txt